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The Migration of Bridled Terns Breeding in Western

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The Migration of Bridled Terns Breeding in Western Corella, 1994, 18( 4): 125-129 THE MIGRATION OF BRIDLED TERNS Sterna anaethetus BREEDING IN WESTERN AUSTRALIA J. N. DUNLOP 1 and R. E. JOHNSTONE2 1162 Swansea Street East. East Victoria Park. WA 6101 2Western Australian Museum, Francis Street, Perth. WA 6000 Received I March 1994 Bridled Terns breeding on the Western Australian coastline are generally absent from their nesting colonies and adjacent seas between early May and mid-September. The recovery of some marked terns banded at colonies in south-western Australia has now identified a definite 'wintering' area. This is located in the north-western sector of the Celebes Sea, between about 4 and 7 degrees north latitude. Mixed flocks of adult and fledgling Bridled Terns observed moving through Lombok Strait, Lintah Strait (between Flores and Komodo Is), and via the Sabu and Banda seas in the Lesser Sundas during April-May are considered to have been Western Australian birds on their post-breeding migration. Flocks observed in Timor Sea in August, September and October are probably birds returning to their Western Australian breeding grounds. INTRODUCTION some information on the Bridled Tern migration. Observational evidence from a number of sources ln Western Australia 30-40,000 pairs of Bridled Sterna anaethetus provides some additional detail on the pattern of Terns breed on at least seventy movement. coastal islands from Lesueur I. ( I 3°50'S), in the ° north Kimberley. south to Seal Is. (34 23'S) in the STUDY AREAS AND METHODS south-west (R. E . .Johnstone and G. M. Storr, unpubl. data). Bridled Terns have been banded hy R. E. .Johnstone (RE.I) on North risherman Island (30°08'S. I l4°57'E: Fig. I) during The portion of this range south of the Houtman 14 breeding seasons between 1971 and the prcsenl. Over that Abrolhos Islands has been colonized since 1900 period approximately 800 birds (adults and pulli) have been and populations in this area continue to expand banded with CSIRO/A1313BS numbered metal rings. (Johnstone 1978; Dunlop and Wooller 1990; Banding was undertaken on Penguin Island (32°I7'S. Dunlop and Jenkins 1994). I I5°4I 'E: Fig. I) by .I. N. Dunlop (JND) and J. Jenkins. Some initial work was done in 1983. resumed in 1986 after a four year At almost all breeding colonies in Western break and continues to the prcscnl. Tu date 2169 13ridkdTerns Australia Bridled Terns arrive on their breeding ( 1493 adults and 676 pulli or llcdglings) have been handed on grounds between late September and mid­ Penguin Island. Details of capture and marking methods are October. The exodus, which involves the adults presented in Dunlop and Jenkins 1992 . As with North risher­ and the annual cohort of fledglings, usually takes man Island. Bridled Terns captured on Penguin Island carried place from early to mid-April. Bridled Terns a uniquely numhered CSIRO/ABBBS metal band. arc absent from the breeding islands, and from When recoveries were reported from outside Australian adjacent seas. between early May and mid­ waters. an attempt was made tO contact the finders in order September (Serventy er al. 1971; Storr 1984; Storr to retrieve as much information as possible. Finders were al. asked about the circumstances of the recovery and about the et 1986; Dunlop and Jenkins 1992). A north­ recovery environment. We also tried to glean any local ward migration has long been postulated for knowledge the finders may have had about Bridled Terns in Bridled Terns nesting on the Western Australian their area and about the harvesting of seabirds or the eggs. coastline, or at least for birds from the southern and mid-western colonies (Serventy et al. 1971). The initial recoveries indicated that Bridled Terns from colonies in Western Australia probably moved through This paper reports on the results of two banding Lombok Strait. and other straits in the Lesser Sundas. on studies in south-western Australia which provide route to their wintering area. Both authors attempted to 125 126 J.N. Dunlop and R.E. Johnstone: Migration of Bridled Terns Corella 18(4) Sea 29 and 30 April 1991: strnit between Tilllor and Sem;1u ls and ,cas offSW Timnr 2 ;incl 8 May I 991: 13anda Sea (between 13amla and Kai ls) 30 September 1992: Banda Sea (between Kai and Aru ls) I and 9 October 19'!2: seas around Kai ls (including 1erong Slrait) 12 and 20 October 1992: seas off SW Tanimbar I.and strnil between Tanimbar andSclaru Is 25 and 29 April 1993 (Fig.2). R. Nujck provided ob,crvations from oil platforms in lite ° ° Timor Sea (.J.1biru Vcnlure I 1 55'33"S. 125 00'2J'E) and ° Challis Venture (12°07'17"S. 125 00'-IJ"E. Fig. 1). RESULTS . Five Bridled Ternshanded at the study colonies 111 south-western Australia have been recovered 0,1 .,. outside of Australian waters. The basic band ,..,,._ returndetails from these recoveries arc presented in Table I. The recovery area is shown on Figure I and the specific locations are plotted on Figure 2. Although these returns involve birds from two colonies approximately 280 kms apart, span a period of 20 years and involve adults and first year birds. the recovery locations fall within a remarkably small and defined area. This lies between about 4 and 7 degrees north latitude in the north-western sector of the Celcbes Sea (Table I. Fig. 2). Four of the five recoveries (3 adults. I year 0) Figu1c· I ..\la11 owli11,• of i\11srmlia all(/ r!,c lndo-l'acific regions were from the austral winter period when Bridled 1/urn·i11g r!,c loca1io11 of 1/,c 111·0 ha11di11g .,·tatiom a11d the rcg11111 111 1/,c 11orrh-11·,,s1cm Ce/ch,,.,. S('// fi-0111 "'hie!, Terns are known to be absent from the seas rc•co,·crit·, hal't' hc,·11 reported. Al,·o shou·n i,\ tltc p1J\itio11 of adjacent to their breeding islands. One tern in its till' oil 11/(l{jor1111 111,·111io111'd i11 the l<'XI. first year of life was recovered at the southern­ most locality in December (Table I). oh,ervc thl' Pt"t•hn:cding migration through LomhokStraight u,ing travcr,c, 011 commercial ferric, (Rl:J on I and '.ll May All three adults recovered were captured alive 1'!88 and .IND 1111 2 and<, �la\' 1993). and in probably all these cases the terns were at DL'tail, of othn ,ca-cro"ing, hy REJ in ferries and tbhing sea. or at least some distance from shorelines. boats .trl.' a, follow,: Ala, Strait (hc·twccn Lornbok and One bird (061-23362) was a member of a group Sumhawa I,) 7 and 211 t--tav and 18 October 1988: ,trait of seven roosting at night on tloating coconut hct\\'ccnSumhawa and San1!�anc Is 21 and D October I 988: shells (Adclma Calunsag. pcrs. comm.). Another ,c·;1, around Sulllhawa and �IOI'<; h <, and 14 November 1988: (061-77422) alighted at night on a small fishing strait bct11c·cn Tinrnr and Scm:1u i, 22 October 1989: Flores. SPl01 and Lalllakera Straits (bctwccn Flore,. Adonara and boat about 240 km from land (Manolito Antipolo, l,e111h;1ta Is) I No\'Clllhcr 11181): L11nakcra Strait (between pcrs. comm.). Both of these recoveries were Lcmbata and Adonara I,) 12 Novclllbcr 1989: Flore, Strail 1-l probably dazzled by ship lights. No\'cmhc1 1989: t--tolo Strait (between Flores and Rinca I,) 12 and l:i :-.ta) 1990: ,ca, and Linlah Strait (hctwccn Flore, The period from June to August is the fishing and Ko111odo t,)17. 20 and 22 May 1990: strait between Tilllor season for the comrnen.:ial boats operating in the and Scmau I, 21{ and_"\() :-.ta} and 20 and 25 October 1990 and Celcbes Sea from southern Mindanao (Adelma 7 ,\pt Ii 1991: R,111 Strait (bct\\'ccn Tilllor and Roti Is) 25 Calunsag. pers. comm.). This presumably corres­ Scplc111he1. 5 October and 18 October 1990: Sahu Sea ponds to the peak season in marine productivity (hct11·c,·11 rimor and Sahu h) 26 September and -I October in the region. Bridled Terns arc referred to as j<J()(l: ,c•a, off SW end of Roti I. 1-1 October 1990: Sahu Sea and 0111ha1 Strati (hel\\'ccn Timor and Alor h) 8 and 9 April 'Kanaway' (Bisayal dialect) in southern Mindanao l'i'll. l'a11tarS1rait (bc111ccn /\lor and l'a111ar h)9. 16and 19 but arc known only as a seasonal visitor; ·Kanaway i\pnl 1991: Alor Strait 22 1\pril 1991: PantarStrait and Sahu is a mystery bird in the Philippines and you found 127 September, 1994 J. N. Dunlop and R. E. Johnstone: Migration of Bridled Terns TABLE I Basic band return data fur Bridkd Ternsmarked on either North f-'ishennan or Penguin Island and recovered in the lndo-Pacitic region. Recovery Recovery Distance (km) Band No. Colom· Date Age co-ordinates date /bearing ° ° ° 1)61-1111170 North Fisherman 7 Jan. 197:\ Year 0 3 52'N. 117 .JO'E 28 Dec. 197:\ Yi-lO. 0 ° ° ° '.\1orthFisherman 3 I Dec. 1979 Year 0 5 09' N. I 19 1YE 18 /\ug.1980 383.J.0 ll61-212n ° ° ° Penguin Island I "1ov.I 986 2+ 6 55' N. 122 05' E 20June 1991 .J305. 12 1161-23362 ° ° ° .122 Penguin Island 7 Oct. 1988 2+ 4 30'N. 122 -lO'E 11 July 1992 .j 155.· 12 ()61-77 ° ° ° (l(i \-2 I 290 North Fisherman 5Jan.l':181 2+ 5 01'N. 119 -16'E 15 June 1993 39-11. 8 it at the sea· (Manolito Antipolo (sic).
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